INSER INTO not working!

Hi list, I'm trying to store a data into a two-column table (id, revision). ID is auto_increment. My table is called REV. I'm using this query: $sqlstring = "INSERT INTO REV VALUES('',$revision)"; Using that same query in mysql command line works pretty good and the row is added to the table, but is not working from my PHP page. I echo the $sqlstring variable for troubleshooting and it is correct. I'm using mysql_query($sqlstring, $link); Any ideas?? -------------------------- MIGUEL GUIRAO AGUILERA